Multiscale modeling of unsaturated flow in dual-scale fiber preforms of liquid composite molding III: reactive flows

摘要: Abstract The woven, stitched or braided fabrics used in liquid composite molding (LCM) display partial saturation behind moving flow-front an LCM mold which is caused by delayed impregnation of fiber tows. In this part 3 the present series three papers, a novel multiscale approach proposed parts 1 and 2 [1] , [2] adapted for modeling unsaturated flow observed dual-scale under non-isothermal, reactive conditions. volume-averaged species resin cure equation, conjunction with mass, momentum energy (temperature) equations, employed to model inter-tow (gap) intra-tow (tow) regions coupling expressed through several sink source terms governing equations. A coarse global-mesh solve global over entire domain, fine local mesh form unit-cell periodic flows. algorithm based on hierarchical computational grids then extended simulation compared two-color experiment previously published two-layer model. Significant differences between temperatures cures gap tow porous medium are observed. ratio pore volumes regions, effective thermal conductivity tows, reaction rate identified as important parameters temperature distributions regions.